One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,10,12)(7,11,8,9)(13,14,18,17)(15,20,19,16)(21,22)(23,25)(24,26)(27,28)(1,2,3,4)(5,7,10,8)(6,9,12,11)(13,14,18,17)(15,16,19,20)(22,23)(24,28)(1,2)(3,4)(5,7,10,8)(6,11,12,9)(13,15)(14,16)(17,20)(18,19)(21,23,25,22)(24,27,28,26)(5,8,10,7)(6,9,12,11)(13,16,18,20)(14,19,17,15)(5,9)(6,7)(8,12)(10,11)(13,17,18,14)(15,20,19,16)(21,24,25,28)(22,26,23,27)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.